2-year visitor visa. What is the maximum stay in the 2-year period? [closed]

I have a 2-year visitor visa that is valid until 2019. I just want to clarify some things:

1. Maximum stay is 180 days. What does it mean? 180 days every visit? So I can just exit Europe and come back after 5 days and another 180 days? Or is there a limitation? Someone told me that even if I have a 2-year visa, I am only allowed to stay 6 months in any period of 12 months. Is it true? I can't find anything on UKBA site. But then I went because I don't want to jeopardize my spouse's visa application.

2. My husband is unemployed at the moment but is looking for a job. He has a house which is mortgage-free and we have combined savings of £25,000. Given that the home office requirement for unemployed is £62,500. Do you think there would be consideration? Anyone with the same case?

3. When my husband gets a job that is more than £50,000 per annum, do we need to wait for 6 months of employment before we can apply for the spouse visa?

All inputs will be appreciated.

Thanks.